Scenario: Earth is faced with a crisis: the planet will soon be destroyed, and the only survivors will be those who can board the Ark ships to journey to Alpha Centauri to settle a brave new world.. The Ark ships can hold 10 million people, but the Earth’s population is 8 billion. Many will be left behind. Suppose you are in charge of choosing who gets a spot on the Ark ships. Who will you draft for your Apocalypse fleet?